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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af4840ead5b05e1b0adc75e038093490aa9362ec6e7a1eddae7d4b44e941732' 
  AND token = 'N6q/P2YEpJ2nQpMJFfEvqdRae4GdCj5v9gVo0rJMlkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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