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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b0510b9f406d9240d7e33b084417a85d4af3cb4a1f578de4806b3735d3cd98' 
  AND token = 'YL3QfL5GbUh0J6EQOxkT+VjZUk1xUreIUmtLpXUl8/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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