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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc51ee34a9f9d7ccbe16ecf8a122a0bc905830974e7d55079b66a68910bc6f93' 
  AND token = 'D0cxuxhWsy7t+neI2FcT5powvalRjTB4Wd/rJx05lf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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