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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34340e51176fe69713c5206596cb67c9c8c4f9eff602900b6eb329018b5a827c' 
  AND token = 'y3n5/9iaePZoiA2QLZBma1A4UgW/aTDlpkey6neuELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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