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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3e7e237f18ffce25188fc026c63a1848192d1dad0de20f22d57777d2f1a7e0' 
  AND token = 'mOqjlH8Wms8liDuUd6Na2R8NfYRf+be9fZExna+UW6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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