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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539eebca69f0834d702c4fd508f82b4ea0bb51f37cfe15cd19ba20bf23467cfa' 
  AND token = 'th9nuWr7poggJX61CXbN4Bbua4Hk+cOVBw0WteDTljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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