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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ebfeb0b1e57e44d55c12ca8ba85dbdf988150780787d144bc25f65a149ba13' 
  AND token = 'qu38uigeCkg11QERjIPYHx/+MKXaG4MqE1qNF/j/2C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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