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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744c698b70aec9fc9e70be7b0769b61fba8a69d68d47dc17d86806a9076338b5' 
  AND token = 'xWI2bJK2VlG/o04yavPofcHq4t2OOKaJQP/WMrohw7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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