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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1513a049089b3fd67024a71028aa85670c0d6c726a962ce7b516a15c3bf1d516' 
  AND token = 'LBSvVB3A6Gzu5IkVcB7M8FSB+f4i7cEEFX6ke0P/UzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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