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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868ccaa7474dddbb1e880c73cc46d7f5f7f6fdb6760280e5ccbd1b7a9c401a02' 
  AND token = 'oFOtWrJR42wk7YeoVobDcR6jnJ08e7byqX91fGVgAvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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