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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad1adaee446b54a08fbfe9f8376e60ab41b1f909b08659f9f511f8df49b1d4f' 
  AND token = 'WjD6giWkr6IBhcEZmtdqXOIEEeDYjkQ766E9CheOKOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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