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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a4d0751111bb5c4eabcce2f9bdc991d4d8f100999f9984b24a8403cbaf4e8f' 
  AND token = 'AvdW8JAvch1FjXD6UWGiK0+eUbSKiaSynyWExkSmRrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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