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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93afdf4c5d1c0e7dc896ec3b18a27264eb176f40c2be0d8316e2a776faa885b9' 
  AND token = 'cWD+7Yl2ElCsTL9BH8JDcswJydkidt0Ib0Be29/pcnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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