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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34bfd5a213ce47df967ae7139cd1155657129e034dba8ef6e0f41875101ca79' 
  AND token = 'TsWcdQ3+uE5ezN/od5x/btByYWv/uGr8bTUrFI3YZHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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