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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0684ac0ed8ada994a780550c86d7e03cd960b6721fa5f9e9258edca7780a0dc8' 
  AND token = 'Z/+h5GEVcO7k/5fzhK8ismS9+IOs5N3LsILyRnuJ2U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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