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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc145613b7f8f58e274fc4851bbffd7eb9db5e24a084053f216287749a683c9' 
  AND token = '6tp3GpdQ9bYN7723BT7Gt6RD0a2q/U16zA7MXUfl9hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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