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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d9d6398ba1a5b2870f7183a339ccb6b35899da24908ef8b4f4ff6c8b9301e5' 
  AND token = 'RVYNdWP794jbHZF3nL4jrg2UpeHLXH+zWdS5r9N/WBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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