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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5768782b463303194e2f571e483aaea3a29d4b3bdfe67f5c5f48195907bf1ad0' 
  AND token = 'vnS0k7wHUNh2P6VSpPwELvnHO9EysS9peANgnhUMs0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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