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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0452606013a73430c9af95afaec0554fb46391a2512404b2ec98f1ca03ea6a' 
  AND token = '6aF1NKi3E9sXNIWsM9hZhcHF6Eb8VFT9e6RVlI5OknY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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