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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936593a735f38f1a812743cdc2e8583d782fccafcf9b1c7f683d1c3033cd0c2c' 
  AND token = '2CIuynZWNAk0Yc7GltJhAEJMPkpyprjBNT/Cc7lSenQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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