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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b9131a031512488b61788a0e662f1ddeb8efda4cd7589285ee2137963244b2' 
  AND token = 'Enj0d1rRQwoyjGDXzPCobOT2e46qzfDPDmT9Fmaa8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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