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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c7bc711c6bd6712011b4ebdf12952b9b733b7361364f3bfcd4d5a376737db' 
  AND token = 's9omilqEfoQQcreJNnpGNa6Wszm5RyAAvKaXwTXGgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00172

JSON explain

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