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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4737af484fab7d7cadec818d6b5e2df7c76da3fe698342acb3cc3feed787b87' 
  AND token = 'rdjBF2K3wq/xjpZmFTJAdxvUIkC8WDVmQ4tY021yd+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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