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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9314c10e7f58d995a11450212c19295c67746a08cf96d117afc94bf6efc0cee' 
  AND token = 'HAc2ghQgpivOwCWJRmJv8Yit7sSKMvwvmdMu3/XFkqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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