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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0c6c6d57dbc7c3cd631ca647dd02e7b58633033e5fdb3cc0dfd8506a9776e5' 
  AND token = 'DbmKg8/j0kFcFnhetAzrq4SAOho8Twovt72hoHUqWNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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