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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3f768d8d1da7ac6e1c68e4369ee8f0796dbdb0a58c723c509aa0c7b31b5426' 
  AND token = 'WDsX0ziSyZx4Zx+TLkrxZBpPggQJQbp4sm2nFdy+u04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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