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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f31fcab6de8740b290f8afd8d4cd4280c9c84bc7bf441a64df98469f2893b70' 
  AND token = 'GuVBzmGKzj2smUvoaD2GZTEh1uaRuGn60F1YvnDKEIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}