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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480512be5ae467528c544c421a1e0268b063965872061287a35bf0a333d58b16' 
  AND token = '06+IiJNJ9P2xZtaE3yfozvFNrxVtUZSu9lD7Se06liE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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