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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a0b2b8bfa6d8900eae286647b156c819b5ce315bf1b7e7fdd6eee063be9763' 
  AND token = '2KavhU1/uW61WWB800ywR6iNwRt+R/x3lsgN/G74L2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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