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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54dbefc4cddcf2b13e58df032755a9474934cc6ed9bcc1bf60ee1ca969b74455' 
  AND token = 'LjVlPiV4z1EnXVuZg7INu9lLCt2uiXqJHiGCvy0EB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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