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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b8fc5dbb058589fa9f9d783c2b6e3fbb2e9ba47838189c47d28ed61a22c7b9' 
  AND token = '+t1fROnm4Wg2YelDXc6q0EA9RM2FfUYRpZZ8cv+BO1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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