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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8aeb61ac739ce1b80447309e9010455c71f763ac4cd9fff7e84114a4169d372' 
  AND token = 'N1AdQcQqcaQxoe13VMVX5zBtM8NOcX2Wsdu2v5YtK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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