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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814d24b98377d76ea1365760ba5f9c48f9cc7d97b25856d23ceed863b93172f3' 
  AND token = 'V3YdSG0RkyKljH4PE8JBdcQnLf/5BJxjeE1PeyT0L28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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