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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d541c71e204df0d6824a1b03c9e2731f4fa1ea01a651433c4e9fd88a87798fc' 
  AND token = 'pZSpIDhgbFX9rBUJE6oHda+bWIap1ii3GuT9edLc2JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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