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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4593f7d7297db1a5cfd8ded74dcc112bc6692d72dfb2133df83573b14d9b3' 
  AND token = 'isDpO7XkG2UHgtTk7WJ0fO4kn+CV/wsd1kLaVUKkUPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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