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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b837f917693510b5edb44be46ac2d6b29d7c8c16da4cfaaa69e781a2fcf97ca5' 
  AND token = '0503PPea1VOxIXtxnc9SBO2HDVAfxoZ/AnlGhteWqa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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