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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ea5a866513623bef142e51b86bf528de078e9651dcc7ad3f7c96e536b731ec' 
  AND token = '2+gx/NpSbH7OUOqhL7PfsxroHf5MCOse0Tr5UhdEMzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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