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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09fe531c6e345b03e7cc42ffaff66569d75271439b50cc8bd6affaf907eb223' 
  AND token = 'Tx/WquFAcyzGBJ6J6eY/iWOy7YAy6xPTGd6HGQxESkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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