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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cde9672092e4d48cf546d2fcd91a8c8683fd8689790e96d9654b27aa3be6f0' 
  AND token = '+M7kmMovjeibZeQyaAUTUgqeJMGWNyX/ptexjdi5uu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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