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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feede885d9b26faa8a63e6364d626bc5fc765f9ffc599d24348be665c11a3ab7' 
  AND token = '5nuvCAuePTX1M44/djWGRrPlfjpd5oUvtbs5q0MOeMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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