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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a30d5e01236c4a12cbe2a6469442701da1742752335800da519f899b225bbd' 
  AND token = 'XjOaCP9N1huKFrcoLOIlvm9BO5+cYBuCJdun6kfAW7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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