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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25f0e52703ff8a3a8ae1cc271ff48be4fa90df97f3395854919489a1ac6b665' 
  AND token = 'BBr+9SAi3MDW6N8FIMatFa6wCV/JAzlJBekOn8m10wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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