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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312b9d15c0acc8b6b516d29bfc35aeafacbcac3a162f60bbb9fb9f48cfd30c1' 
  AND token = 'LKI8DxBPo+EKVZbfwqj3diOa0Vg+gqDG6qh/Qwp92GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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