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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a583df79924ca3ae3dbe1b17a9ac014f2faa5d6facfe67bdfd4fc65d2e7b97' 
  AND token = 'i8THGf9PzmZfo2ul0Ci7RRnQPE2D7zmMxWsJHujQ/Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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