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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b726bd7e9af0c5f3f6e9b2d53d15326fd047cca131192f06a1207d5aaa4b69' 
  AND token = 'Zm1vkS6y7bFVdKSFovIsBKKNIceU86gF7AKYxsgD9vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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