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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdb4f9748f8a79c324f047423fe38c403472af2fe7e59c8281a7b8d058be0a5' 
  AND token = 'ukyRusS5zNU6DeQcEpKv77hCbbp6iz0wu3dOl0IGxz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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