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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3def8b7c5584dba7869b31beb8e48f96838a58cab1905a778d37a4c1ae8acc1b' 
  AND token = '9kXEP1WuDeRlELjN4aD7lNt36JyUGZ5IlLxRZfIkb40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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