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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c3ed6f56d903c9e5d805b240d8e78d2725ce5f3c413e8d29c6c52ee2936e73' 
  AND token = 'k+0BiI4q6H6kTykjbY75LyuT50SxRCttHin+qC5B1CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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