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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7afc7c18ea161e92f7d1e26e6144f86940db697a64d077ac12527bda6675a9a' 
  AND token = '01Lc9gr9JuvAv5066uUEGsj0rf9qfz6jGVTBE7orTr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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