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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17addbd6c220c2665a0d404b1fc195adf418ebdb4f5754af346720e0810f0397' 
  AND token = 'O9ugQauoZhge2pZ8/fcHKgwpDiuvcNrf6HCemLY9DLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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