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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aba2faa2bf0eaa1e6d5803220c99633c49ed0c619e94f052a02d7e65a9241a1' 
  AND token = 'Oq5ZgS/2g93tvFGKBoeIkztUDUyad6rYjTjNvetcJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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