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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713038bf0519d345cb5e5b578f54a11906e4aa89e898032bfe8cff0d9474b16f' 
  AND token = 'spXyEJKIF0fR6xAK9VngcQnHPMCAyNvlJE3H8qQRqCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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