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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8995007bcf2f637e170d34fe16e1a2b0f339839af98d91a366dcce0e388ccf5' 
  AND token = 'VnIr8xwP9LKqKI7T08H7TBQNg2PuRXJ5ss0gdWVA2lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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