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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f3b3b11a4e958a014ebb3ca5b2583644f688715cafbb3ea7f4a17a6e2bad09' 
  AND token = 'y+WiJDUy72C1Yjbgy1NNAmXyMpAYXqwMS/UPQ9mrQGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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