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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb99b6e3e6b111b66303e7d849ae7b884e2aa343aef10c4b7171fca301297a87' 
  AND token = 'kbCqqy5/BvlyzShI/Wx4yIIgTz7YA67upUuTYesQj/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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