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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc5b39139698c83804c3e524a3d26b9de47af49db2e9e507046d2b3d58fd5c9' 
  AND token = 'A0e1vz2wlY6Ck4SxvRBYBPLHT+x9KrNHYCzO89bXT30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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