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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3193ad6b504c32c05f3a913b1336db69f9ef695529ac81ad476e69a29d79dd95' 
  AND token = 'Nn70TLFsba01hymmscxkHaHHPveGYrflhC6p30g7CJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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