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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb84ca0d95d5b75b658bebfd186f3e7d73714ec9be3faba3cc8d5d2dd5b723e8' 
  AND token = 'ZL6RPj9rjWVwMIlnooAOwswQW64THZ+KkgrYt1HdFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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