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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a83931e5edf4e20ba69c1af3f1836bf613fece4052a04c7df434ef8f241534' 
  AND token = 'FSvIgR5ensN4xdLbZnwek0QkMB4ACXSGsTo4+YHBOUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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