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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48693d5c153c46795427ed7a810af60274776a842399a73346046772a84ab7c' 
  AND token = 'HFJWIhomozUDaLPky6II6adMjaISsi3qfwPkx94FDrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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