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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9221648688e198248ab5b89c6ff61bc8b3386e0681ea19d3accb05aaf1280c5c' 
  AND token = 'boAsGKBmUFwM893vSV8d8UPK+x6Ccl3NJttPWMMPwwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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