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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc56bbe01d6ae559582a57603189bede4d73f714c42a606d7c6c239be1587694' 
  AND token = 'ik1yKlIfw5J3+61hoxtgUIMV5193phDzDsc5yqSM1kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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