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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12af99dacf6744f3270c5e192595da419483764f17a862442b1ef2af7c94ca23' 
  AND token = 'a65MHo43mAs2uuavKGuUds0wfmoqcpjys3B3fOgD9vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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