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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ce1f1eb7f9d49e97ed580b7d8602a69a6cc10e5e8d4ed1b76fd5b41710b96f' 
  AND token = 'bNGH2M7I2KyIqgexYMKhNcqSqGT9C1hsVOfTZtvNwgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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