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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e029745728eb8563286b2830eac3bdb8d6605e339fa42b1aed251dbbde63f2' 
  AND token = 'hxiHp9g0O3L4tjJ1d4DY0rr9e56l2DWSWKPBQzHc6vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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