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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350c44cda4ef4be930dcb0d9f92d75307895bc189a5e6852f65b592e6a26e3bc' 
  AND token = 'IRguHwKU0qvJ0hwVH7dkE/yH34XInddz866NfB9mkj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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