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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5683a35ab74f756ad2651253d42951fdce84d02202a526215ad4d811494706fc' 
  AND token = 'tcrzHnF/IbWuZ1g43Nqi3Cp8JqvuBL0CV8F0TbcsnOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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