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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d8be38f8076bbab71feef4e2695952bfceaf52b8c09d68058bef863e49dd4c' 
  AND token = 'I119zH1kDQH94dEcZ2m5PSiJBEBUDn15VSKQwGffJiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00195

JSON explain

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